04-09-2017, 06:55 PM
Hi Miguel, they look like "mouldaseal " types, usually a paper based dielectric with a moulded plastic cover. They were the successor to waxed paper types but not much better at developing leakage when there was a crack in the covering.
Typically used in valve sets with up to 300v HT.
To check apply rated voltage from a DC power supply via a high wattage 10K resistor and measure leakage. Any leakage , even 1uA could be a problem in the feed to a signal grid. That level of leakage would not be a problem as a screen grid decoupler in practice.
Not sure how they would have been affected by the Cuban climate.
Ed
Typically used in valve sets with up to 300v HT.
To check apply rated voltage from a DC power supply via a high wattage 10K resistor and measure leakage. Any leakage , even 1uA could be a problem in the feed to a signal grid. That level of leakage would not be a problem as a screen grid decoupler in practice.
Not sure how they would have been affected by the Cuban climate.
Ed
